code: def ml20m():
      if _ml_20m:
          return _ml_20m.ratings
      else:
          pytest.skip("ML-20M not available")
  
file_path: lkpy/tests/test_ml20m.py
imports: import logging
  from pathlib import Path
  from lenskit.datasets import MovieLens
  from lenskit import batch
  from lenskit.algorithms import Recommender
  from lenskit.algorithms.basic import Popular
  from lenskit.algorithms.als import BiasedMF
  import pytest
label_desc: Use image node_id 1 for calling a global function with example usage: ml20m() and returns: _ml_20m